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<H1>curs_overlay 3x</H1>
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<STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>                                       <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>




</PRE>
<H2>NAME</H2><PRE>
       <STRONG>overlay</STRONG>, <STRONG>overwrite</STRONG>, <STRONG>copywin</STRONG> - overlay and manipulate
       overlapped <STRONG>curses</STRONG> windows


</PRE>
<H2>SYNOPSIS</H2><PRE>
       <STRONG>#include</STRONG> <STRONG>&lt;curses.h&gt;</STRONG>

       <STRONG>int</STRONG> <STRONG>overlay(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*srcwin,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*dstwin);</STRONG>
       <STRONG>int</STRONG> <STRONG>overwrite(const</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*srcwin,</STRONG> <STRONG>WINDOW</STRONG> <STRONG>*dstwin);</STRONG>
       <STRONG>int</STRONG> <STRONG>copywin(const</STRONG>  <STRONG>WINDOW</STRONG>  <STRONG>*srcwin,</STRONG>  <STRONG>WINDOW</STRONG>  <STRONG>*dstwin,</STRONG>  <STRONG>int</STRONG>
       <STRONG>sminrow,</STRONG>
             <STRONG>int</STRONG> <STRONG>smincol,</STRONG> <STRONG>int</STRONG> <STRONG>dminrow,</STRONG> <STRONG>int</STRONG> <STRONG>dmincol,</STRONG> <STRONG>int</STRONG> <STRONG>dmaxrow,</STRONG>
             <STRONG>int</STRONG> <STRONG>dmaxcol,</STRONG> <STRONG>int</STRONG> <STRONG>overlay);</STRONG>


</PRE>
<H2>DESCRIPTION</H2><PRE>
       The  <STRONG>overlay</STRONG>  and <STRONG>overwrite</STRONG> routines overlay <EM>srcwin</EM> on top
       of <EM>dstwin</EM>.  <EM>scrwin</EM> and <EM>dstwin</EM> are not required to  be  the
       same  size;  only  text  where  the two windows overlap is
       copied.  The difference is that <STRONG>overlay</STRONG> is non-destructive
       (blanks  are not copied) whereas <STRONG>overwrite</STRONG> is destructive.

       The <STRONG>copywin</STRONG> routine provides a finer granularity  of  con-
       trol over the <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> routines.  Like in the
       <STRONG>prefresh</STRONG> routine, a rectangle is specified in the destina-
       tion  window,  (<EM>dminrow</EM>,  <EM>dmincol</EM>) and (<EM>dmaxrow</EM>, <EM>dmaxcol</EM>),
       and the upper-left-corner coordinates of the  source  win-
       dow, (<EM>sminrow</EM>, <EM>smincol</EM>).  If the argument <EM>overlay</EM> is <STRONG>true</STRONG>,
       then copying is non-destructive, as in <STRONG>overlay</STRONG>.


</PRE>
<H2>RETURN VALUE</H2><PRE>
       Routines that return an integer return <STRONG>ERR</STRONG>  upon  failure,
       and  <STRONG>OK</STRONG>  (SVr4 only specifies "an integer value other than
       <STRONG>ERR</STRONG>") upon successful completion.

       X/Open defines no error conditions.  In  this  implementa-
       tion,  <STRONG>copywin</STRONG>,  <STRONG>overlay</STRONG>  and <STRONG>overwrite</STRONG> return an error if
       either of the window pointers are null, or if some part of
       the window would be placed off-screen.


</PRE>
<H2>NOTES</H2><PRE>
       Note that <STRONG>overlay</STRONG> and <STRONG>overwrite</STRONG> may be macros.


</PRE>
<H2>PORTABILITY</H2><PRE>
       The XSI Curses standard, Issue 4 describes these functions
       (adding the const qualifiers).  It further specifies their
       behavior in the presence of characters with multibyte ren-
       ditions (not yet supported in this implementation).


</PRE>
<H2>SEE ALSO</H2><PRE>
       <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="curs_pad.3x.html">curs_pad(3x)</A></STRONG>, <STRONG><A HREF="curs_refresh.3x.html">curs_refresh(3x)</A></STRONG>



                                                       <STRONG><A HREF="curs_overlay.3x.html">curs_overlay(3x)</A></STRONG>
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